Responses
Hyo Bin forced Eun Sung and he dated with her because his dead friend was in love with her. It's easy to understand:)
No one would come near, kiss or touch him because of the misunderstanding about him having an illness (aids) like his father (he wasn't sick) and thats the secret he spilled to Hyobin while been drunk hence nothing happened between them. Meaning he has not been touched or kissed by any girl before Yaewon...

Sorry, I don't get it: how can Han Yae-Won be Ji Eun-Sung's first kiss if he had already dated girls (or at least one, Kim Hyo-Bin) before meeting her? It makes no sense, especially since in vol. 2 ch. 9, Eun-Sung and Hyo-Bin are caught red handed...